Mate just take your time and be methodical, another good thing to do is a compression check.

I got so pissed off with mine i took every boost hose off, the breather system off, the intercooler off. Cleaned it all then put every thing back together in case there was an air leak any where.

Then i took every connector i could see off and cleaned it with connector cleaner.

Replaced my water temp sensor (located under the inlet manifold)

and now it starts (9 times out of 10 lol).

Let us know what happens

Rob,